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Date:   Fri, 13 Nov 2020 04:53:11 +0200
From:   Vladimir Oltean <olteanv@gmail.com>
To:     Christian Eggers <ceggers@arri.de>
Cc:     Jakub Kicinski <kuba@kernel.org>, Andrew Lunn <andrew@lunn.ch>,
        Richard Cochran <richardcochran@gmail.com>,
        Rob Herring <robh+dt@kernel.org>,
        Vivien Didelot <vivien.didelot@gmail.com>,
        "David S . Miller" <davem@davemloft.net>,
        Kurt Kanzenbach <kurt.kanzenbach@linutronix.de>,
        George McCollister <george.mccollister@gmail.com>,
        Marek Vasut <marex@denx.de>,
        Helmut Grohne <helmut.grohne@intenta.de>,
        Paul Barker <pbarker@konsulko.com>,
        Codrin Ciubotariu <codrin.ciubotariu@microchip.com>,
        Tristram Ha <Tristram.Ha@microchip.com>,
        Woojung Huh <woojung.huh@microchip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@microchip.com>,
        netdev@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next v2 10/11] net: dsa: microchip: ksz9477: add
 Pulse Per Second (PPS) support
Message-ID: <20201113025311.jpkplhmacjz6lkc5@skbuf>
References: <20201112153537.22383-1-ceggers@arri.de>
 <20201112153537.22383-11-ceggers@arri.de>
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On Thu, Nov 12, 2020 at 04:35:36PM +0100, Christian Eggers wrote:
>  static int ksz9477_ptp_enable(struct ptp_clock_info *ptp, struct ptp_clock_request *req, int on)
>  {
> -	return -ENOTTY;
> +	struct ksz_device *dev = container_of(ptp, struct ksz_device, ptp_caps);
> +	int ret;
> +
> +	switch (req->type) {
> +	case PTP_CLK_REQ_PPS:
> +		mutex_lock(&dev->ptp_mutex);
> +		ret = ksz9477_ptp_enable_pps(dev, on);
> +		mutex_unlock(&dev->ptp_mutex);
> +		return ret;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
>  }

Richard, do you think we can clarify the intended usage of PTP_CLK_REQ_PPS
in the documentation? It doesn't appear to be written anywhere that
PTP_ENABLE_PPS is supposed to enable event generation for the drivers/pps
subsystem. You would sort of have to know before you could find out...